engine RENAULT SCENIC 2008 J84 / 2.G Gas Injection LPG 3000 Workshop Manual

1Engine and peripherals
V2 MR-372-J84-17C000$TOC.mif
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17C
"The repair procedures given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
The procedures may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from
which his vehicles are constructed."
V2
All rights reserved by Renault s.a.s.
Edition Anglaise
Copying or translating, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of
Renault s.a.s.
© Renault s.a.s. 2008
GAS INJECTION
LPG 3000
Program No: AB
Vdiag No: 08/10
Fault finding - Introduction 17C - 2
Fault finding - System operation 17C - 9
Fault finding - Replacement of components 17C - 13
Fault finding - Configurations and programming 17C - 14
Fault finding - Fault summary table 17C - 15
Fault finding - Interpretation of faults 17C - 16
Fault finding - Conformity check 17C - 54
Fault finding - Status Summary table 17C - 76
Fault finding - Interpretation of statuses 17C - 77
Fault finding - Interpretation of parameters 17C - 83
Fault finding - Command summary table 17C - 89
Fault finding - Interpretation of commands 17C - 90
Fault finding - Customer complaints 17C - 98
Fault finding - Fault finding chart (ALP) 17C - 99

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GAS INJECTION
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedures applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring Diagrams:
–Visu-Schéma.
Type of diagnostic tools
–CLIP + multiplex line sensor
Special tooling required
3. REMINDERS
Procedure for Mégane 2
To carry out fault finding on the vehicle's computers, switch the ignition to fault finding mode (forced + after ignition).
Proceed as follows:
–Put the vehicle card in the card reader.
–Press and hold Start button (longer than 5 seconds) with start-up conditions not fulfilled.
–connect the diagnostic tool and perform the required operations.
To cut off the + after ignition feed, proceed as follows:
–disconnect the diagnostic tool,
–press the Start button twice briefly (less than 3 seconds),
–ensure that the + after ignition feed has been cut off by checking that the computer indicator lights on the
instrument panel have gone out.
Procedure for Logan
To run fault finding on the vehicle computers, switch on the ignition. Connect the diagnostic tool and perform the
required operations.Vehicle (s): LOGAN and MEGANE 2
Function concerned: Gas Injection
Engines: K4M 764/788/698Computer name: GAS 3000
Program No.: AB
Vdiag No.: 08/10
Special tooling required
Multimeter
Elé. 1681 Universal bornier
Note:
The left-hand and right-hand xenon bulb computers are powered when the dipped headlights are lit.
Fault finding on these computers is therefore not possible until after the ignition has been switched on in
diagnostic mode (forced + after ignition) and the dipped beam headlights have been switched on.
GAZ3000_V08_PRELI / GAZ3000_V10_PRELI
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$059.mif

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MR-372-J84-17C000$059.mif
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GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
2. FAULT FINDING LOG
You will always be asked for this log:
–when requesting technical assistance from the Techline,
–for approval requests when replacing parts for which approval is obligatory,
–to be enclosed when returning monitored parts on request. The log is needed for warranty reimbursement,
and enables better analysis of the parts which have been removed.
5. SAFETY INSTRUCTIONS
Safety rules must be observed during any work on a component to prevent any damage or injury:
–make sure that the battery is properly charged to avoid damaging the computers with a low charge,
–use the appropriate tools.
Safety instructions that must be followed before any operation is performed on the vehicle
–If a major LPG leak occurs, the vehicle must be isolated, away from buildings and any fire risks.
–the emergency services may be required to intervene if the situation cannot be controlled.
–all work on the LPG circuit must be performed by qualified and authorised personnel,
–do not try to open the tank. Never try to remove the multi-valve located at the end of the tank.
–do not clean the engine compartment using a pressure system with detergents.
–always refer to the RENAULT Workshop Repair Manual before performing any work.
Safety instructions that must be followed when any operation is performed on the vehicle
–all work must be carried out in a well-ventilated space,
–there must not be any naked flames, sparks, lit cigarettes or telephones near the area where work is being
carried out,
–the operator must not wear acrylic clothes likely to generate static electricity.
–disconnect the battery and leave the vehicle on the ground,
–if working on the tank, drain it by running the engine in LPG mode,
–once drained and removed, the tank can be sent to GIAT, complete with its mounting,
–if work is to be done in the spray booth, remove the tank (with its mounting),
–the tank must not be subjected to temperatures greater than 50°C. IMPORTANTIMPORTANT
Any fault on a complex system must undergo a thorough fault finding procedure with the
appropriate tools. The FAULT FINDING LOG, which should be completed during the fault finding
procedure, ensures a record is kept of the procedure carried out. It is an essential component
when consulting the manufacturer.
IT IS THEREFORE MANDATORY TO FILL OUT A FAULT FINDING LOG EVERY TIME
THE TECHLINE OR THE WARRANTY RETURN SERVICE ASKS FOR IT.

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GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
Safety instructions that must be followed after any operation is performed on the vehicle
–after working on an LPG union, check that it is not leaking after it has been refitted,
–apply soapy water or the product distributed by SODICAM, part number 77 11 143 071 (leak detector) to the
open union(s),
–fill the fuel tank with a few litres of LPG if it has been bled (the ignition must be switched off first),
–start the engine, put it in LPG mode and check again that there is no leak,
–if a leak is detected, retighten the union concerned. If the leak persists, refit the union,
–fill the fuel tank (80% of the total volume). start the engine, put it in LPG mode and check that there is no leak,
–after refitting, check that all the rubber and encased steel LPG pipes are not in contact with any parts that may
cause them to wear and create an LPG leak.

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GAS INJECTION
Fault finding - Introduction
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
ROAD TEST (in Petrol mode, then in LPG mode)
–check that the stabilisation time is normal,
–check that the engine does not stall under sudden braking and that it maintains a stable idle speed until the vehicle
comes to a stop,
–put the vehicle in 4th gear, at a steady speed of 36 mph (60 km/h). Check that the vehicle accelerates
progressively under full load acceleration.
Maintenance operations:
–no adjustment,
–removal of internal components is not permitted,
–if LPG clips are removed, they must be replaced,
–if LPG unions are removed, they must be replaced.
The tank must be bled before removing:
●the fuel tank,
●a component bolted to the fuel tank,
To remove the following, bleed all gas contained in the gas circuit (except the gas in the tank):
●the filler neck,
●the pipes,
●the filter,
●the pressure relief valve,
●the solenoid valve. IMPORTANT
Before performing any work on the vehicle, drain the LPG circuit.
Only personnel who have undergone special LPG training can work with gas unions where gas is circulating and
which run from the expansion valve via the fuel tank.
Equally, only these persons are permitted to perform servicing and repair operations on LPG vehicles.
Workshops can only carry out work on the fuel tank if they have a degassing burner. If the tank cannot be
degassed, do not carry out any work and contact the Comité Français du Butane et du Propane (French
Butane and Propane Commission) by fax on 01 41 97 02 89.

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GAS INJECTION
Fault finding - System operation
1. System operation:
Composition
–The LPG injection system consists of the:
–LPG tank,
–fuel sender,
–overpressure unit (thermally triggered),
–LPG solenoid valve relay,
–tank solenoid valve,
–reducer (LPG) or expansion valve (CNG),
–expansion valve,
–filling spigot or socket,
–LPG hose,
–tank pressure sensor,
–LPG pipes,
–unions,
–airtight cover,
–regulator valve or anti-return valve,
–excess pressure valve,
–LPG filter,
–temperature and pressure sensor,
–LPG computer,
–LPG expansion solenoid valve,
–gas injectors,
–LPG or petrol selection switch,
–fuel sender relay,
–LPG tank relay,
–fuel pump cut-off relay.
Operating principle
The GAS 3000 computer electronically manages the operation of the LPG systems (Liquefied Petroleum Gas) and
CNG (Compressed Natural Gas).
The engine must be started in Petrol mode. The vehicle will automatically switch to "Gas" mode after starting if the
"gas" configuration was selected beforehand. "Petrol" mode switches to "gas" mode after a certain time delay, which
depends on the engine coolant temperature.
Petrol mode operates autonomously. Information is shared between the Petrol computer and the LPG computer via
a CAN connection.
The K line shared by the two computers allows diagnostics to be run on both the petrol and the LPG systems.
The Petrol computer is also the supervisor of the LPG system and includes, in addition to petrol-specific functions,
functions for adapting engine management programming to LPG operation.
Therefore, the Petrol computer includes settings and variables that are specific for LPG operation, e.g. ignition
advance adjustment in LPG mode, LPG flow rate setting, richness regulation, engine operating mode, etc.
It controls the choice of program (petrol start-up etc.) and controls the transition phases for switching from one
operating mode to the other: Petrol → Gas or Gas → Petrol. The fuel pump is regularly supplied to keep the system
under pressure in the event of a possible return to "Petrol" mode (if the "Gas" tank is detected as empty or if a fault
is detected).
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$118.mif

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MR-372-J84-17C000$177.mif
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GAS INJECTION
Fault finding - Replacement of components
COMPUTER REPLACEMENT OR REPROGRAMMING PROCEDURE
The system can be programmed and reprogrammed via the diagnostic socket using the RENAULT CLIP diagnostic
tool (see Technical Note 3585A or follow the instructions provided by the diagnostic tool).
After reprogramming or replacing the computer:
–Switch the ignition off and then on again.
–Start and run the engine in LPG mode then stop the engine (to initialise the computer) and wait for
30 seconds.
–Switch on the ignition and use the diagnostic tool to carry out the following steps:
–use command VP001 Write VIN,
–after the injection has been reprogrammed, stored faults may appear on other computers. Clear the memories of
these computers,
–carry out a road test followed by another check with the diagnostic tool. IMPORTANT
–switch on the diagnostic tool (mains or cigarette lighter supply),
–connect a battery charger,
–shut down all the electrical consumers (lights, interior lights, air conditioning, radio CD, etc.),
–wait for the engine to cool down (coolant temperature below 60 °C and air temperature below 50 °C).
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$177.mif

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MR-372-J84-17C000$295.mif
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GAS INJECTION
Fault finding - Fault summary table
Tool fault Associated DTC Description
DF0032617 Engine speed inconsistency
DF0071B47 Main relay circuit
DF0131B40 Tank solenoid valve circuit
DF0141B42 Gauge supply circuit
DF0161685 Impact detected
DF0171094 LPG leak detection downstream of expansion valve
DF0180512 + after ignition feed
DF0191B05 LPG pressure sensor circuit
DF0201B45 Fuel sender switching relay circuit
DF0211B46 LPG tank solenoid valve relay circuit
DF0221B60 Computer
DF0241B43 Fuel pump cut-off relay circuit
DF026C073 Multiplex network
DF0291B20 LPG tank sender signal voltage
DF0300657 LPG tank sender supply voltage
DF0311B61 LPG pressure downstream from expansion valve
DF061C100 Multiplex network
DF0740336 TDC signal circuit
DF0800560 Battery voltage
DF0811B32 Cylinder 2 injector circuit
DF0831B00 LPG pressure sensor circuit
DF0871B34 Cylinder 4 injector circuit
DF0881B33 Cylinder 3 injector circuit
DF0921B05 Expansion valve downstream LPG pressure sensor circuit
DF0951B10 LPG temperature sensor circuit
DF0960641 Sensor supply voltage
DF0981B31 Cylinder 1 injector circuit
DF0991B49 Instrument panel indicator circuit
DF1031B41 LPG expansion valve solenoid valve circuit
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$295.mif

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MR-372-J84-17C000$354.mif
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GAS INJECTION
Fault finding - Interpretation of faults
DF003
PRESENT
OR
STOREDENGINE SPEED CONSISTENCY
1.DEF: Signal incoherent
2.DEF: Non-compliance with emission control standards
NOTESConditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine has been running for 10 seconds in
LPG mode.
Appearance conditions:
The fault appears when the difference between the hard-wired petrol computer engine
speed signal and the multiplex network engine speed is greater than 300 rpm.
Manipulate the wiring between the LPG computer and the petrol computer in order to produce a change in status
(present ↔ stored).
Look for any damage to the wiring harness and check the connection and condition of the LPG computer and its
connections and carry out the same checks on the injection computer.
Repair if necessary.
Check the insulation and continuity on the wires of the following multiplex connections:
For Mégane 2:
LPG computer track A1
LPG computer track A2
For Logan:
LPG computer track A1
LPG computer track A2track K3, connector B, petrol computer
track K4, connector B, petrol computer
track 25 of the petrol computer
track 26 of the petrol computer
Repair if necessary.
Check the insulation, continuity and the absence of interference resistance on the connection between:
LPG computer track F1 track C3, connector B, of the petrol computer
Repair if necessary.
If the fault is still present, deal with the other faults, then proceed to the conformity check.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF003 / GAZ3000_V10_DF003
LPG 3000
Program No: AB
Vdiag No: 08/10
MR-372-J84-17C000$354.mif

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MR-372-J84-17C000$354.mif
V2
GAS INJECTION
Fault finding - Interpretation of faults
LPG 3000
Program No: AB
Vdiag No: 08/10
17C
DF007
PRESENT
OR
STOREDMAIN RELAY CIRCUIT
1.DEF: Voltage outside permitted range of values
2.DEF: Non-compliance with emission control standards
NOTESConditions for applying the fault finding procedure to stored faults:
The fault is declared present after the engine has been started and switched to LPG
mode.
Manipulate the wiring harness between the LPG computer and the main relay in order to produce a change in
status.
Look for any damage to the wiring harness and check the connection and condition of the main relay and its
connections (present ↔ stored).
If necessary, repair or replace the connector.
With the ignition on, check for +12V on track 1 and track 3 of the main relay.
If no + 12 V:
–disconnect the battery,
–in the Protection and Switching Unit, disconnect the grey connector,
–check the cleanliness and condition of the connections,
–Use the universal bornier to check the continuity of the following connection:
For Mégane 2:
Protection and Switching Unit, grey connector, track 1
For Logan:
Fuse box, track S4track 3 of the main relay
track A5 of the main relay
Repair if necessary.
Check the insulation in relation to + 12V and the continuity and absence of interference resistance on
the connection between:
LPG computer track F4 track 2 of the main relay
Repair if necessary.
With the ignition on, check for earth on track 2 of the main relay.
If, with the ignition on, the computer does not control the main relay on track 2 via an earth, contact the Techline.
With the engine running, check that the relay clicks when LPG mode is selected.
Replace the main relay if necessary.
If the fault is still present, deal with the other faults, then proceed to the conformity check.
AFTER REPAIRDeal with any faults displayed by the diagnostic tool.
Clear the computer memory.
Carry out a road test followed by another check with the diagnostic tool.
GAZ3000_V08_DF007 / GAZ3000_V10_DF007